wsm STW37 Workshop Manual page 389

STW34, STW37, STW40, WSM
 Neutral
While the spools (4), (5), (7) are in neutral position,
the pressure-fed oil from the hydraulic pump is delivered
into the P port and flows to 3-point linkage control valve
through PB port.
(1) Check Valve
(2) Check Valve
(3) Check Valve
(4) Spool
(5) Spool
(6) Unload Valve
(7) Spool
P: P Port
(From Hydraulic Pump)
PB: PB Port
(To Control Valve)
T: T Port
(To Transmission Case)
 Double Acting Valve – Lift
When the spool (3) moves to left, the passage from
P port to PB port is closed. The pressure-fed oil opens
the check valve (2) and flows to implement cylinder via
port. The return oil from implement cylinder flows from
A
2
port to transmission case through T port.
B
2
(1) Double Acting Cylinder
(2) Check Valve
(3) Spool
P: P Port
(From Hydraulic Pump)
PB: PB Port
(To Control Valve)
8-M19
HYDRAULIC SYSTEM
A : A Port (To or From
1 1
Implement Cylinder)
A : A Port (To or From
2 2
Implement Cylinder)
B : B Port (To or From
1 1
Implement Cylinder)
B : B Port (To or From
2 2
Implement Cylinder)
B : B Port (To or From
3 3
Implement Cylinder)
9Y1211109HYM0022US0
T: T Port
(To Transmission Case)
A : A Port (To Implement
2 2
Cylinder)
B : B Port (From Implement
2 2
Cylinder)
9Y1211109HYM0023US0
KiSC issued 11, 2014 A